Let $A$ be a non-empty subset of $\mathbb{R}$ which is bounded above. Define$$B=\{ 2a+3:a\in A \}$$Prove that the set $B$ is bounded above and has a supremum.
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Let $A$ be a non-empty subset of $\mathbb{R}$ which is bounded above. Define$$B=\{ 2a+3:a\in A \}$$Prove that the set $B$ is bounded above and has a supremum.